Magnetic brake.



No. 758,140. PATENTEDAPR.26,1904.

- J. n. IHLDER.

MAGNETIC BRAKE. APPLICATION rILnn SEPT. a, 1903 N0 MODEL.

so I E? 3 *flaa 70 l 2 22 70 4 I 8 I .wamessas: INVENTOR" 1 I v I ATTORNEY preferul il} .11-(legignates a. l I v 'snitable ednstrue on r topitheipairt' from in agr'iet; 'ivhieh' in pra'etie S ATE Patented April 26, 1904 PATENT OFFICE. I

JOI-{N I); nnirmni, OF YON'KERS, NE 'YO'RK, IASSIGNOR To OTIISIELEVA'ITOR COM PANY, ()F

0 meter t0 the'biirt '10 ten'dl rotating An here show the ljmke :11 is in the plunger type,

' 22 designates tlwexejtmgmml lftlueleetro- 3 molar hohlmi and'QJO :i netnlhe frame. In

which the exeltln -enll Isa-ranged. .lhememllielfriin e 20 is' ef 'sueh shape and m'rz'mgeff ment :15 t0 provlde u-elosedpr a substant ally cldsed nuignetieeireuit. 'Jhiiem'e ef'tlumay witlrtlu frzuue .er" itfuury integral with 'SPECIEICAJTION forming mof Ltter Patent Her-758,140, dated April 26, 12994;

' er-m 51011531581155"glaoag 835 110,111,649; gu my) the ethe ether-part, 21, moves in "andbu't'of tl e'exeiting-eoil. The part. 21in joined'hy 'a conneetienjlil with the brake 11,

pgiilg and-fis js urroun ding.the connection 12, ,fld between the brake 11 and some v xamplmthe frame'20.;.

jnate eonduetors leading from -fe1eetricalsupply, and 81 82 two'c dill OISlQading. from theconductors A Btejthe terminals of the exciting-coil 22.

intliii ir'cuit' of the exciting-coil in slstanee 81) and a suitable form of uOanioy able into and outof a contact 51,- also included iii two places in such manrtolliridge'theresistance 80,:1nd it is alo joinedt0? the eenductur 82. included in QI Q Q ICW are two ;circuit-controllers rere shown each as vbeing in the l'erm' Of u 1 ,$wi tch. l The circuit-c0ntruller is adaptiul ti) he meved into and out of engagentluetertli l ment witha (mum 3.1,inehuled in the condngtor Signed the circuit-controller i0 15 :u upted to he moved mto and out- 013 engagement with a Contact 41,:1ls0 included in the enndnetol lfiil. 5, It .will-he seen that when the eirend-controllers 30 and 5t) :u-emeved into engzi-giement with their respective euntaets 31 and 51 v(nu-gent frein'the cmulnetm's A B Wlll flow, direc l vthrguglr. the (-X(.ll,lll} ;'-Q0ll 22, which iitilltlifljidfilw the part 21 of theeorc ilhin it, :uulthus withdraw the brake ll lrm'n'the fpm't 10 againstthe action (if the spring 13; which always aetq'tn apply the brake 11. The current from the conducwrs A B will not entirely flow flirough the resist- 0nd cter whieh isjoinedto resistance into the circuit at'this time is to citing-coil.

the circuit-controller 40 is moved into engage-' ment with the contact 41 and the circuit-controller 50 preferably moved outpf engagement with the contact 51. This operation of the circuit-controller causes the exciting-current to be short-circuited from the excitingcoil if the circuit-controller fit) is'notbw ated or the exciting-current interrupted if the controller is operated. As soon as either of these operations'occur there will be a decrease of the magnetic flux. The operation of the circuit-controller 40, however, establishes a closed circuit for the exciting-coil,

' and as that magnetic flux decreases it'induces 8. currentfin the exciting-coil which-tendsto build up the decreasing magnetic flux. "In this way a slow and gradual application of the brake 11, under the influence of the spring 13, is obtained.

Referring now to Fig. 2, it will'be seen that- I employ an additional winding 23 on-the exciting-coil and provide n this winding a circuit-controller 60, here shown as being in the form ofa switch which is movable into and out of engagement with ,a contactfil. This circuit controller is adapted to open and close the circuit for the winding 23. If desired,

this circuit-controller may be omitted entirely and the circuit always be a closed one. In this figure the controller in the circuit of the exciting-coil is I designated 7 0, and, as shown, is in the form of a switch movable into and out of engagement with a contact 71. In this forinwhen the brake is to be withdrawn 'from the part 10 the circuit-controller 70 is first operated to close the circuit of the exciting-coil, and the circuit-controllerisleft in such position as to always keep this circuit closed so long as the brake is to be held out of engagement with the part 10. When the brake is to be applied,

the circuit-controller 60 is first operated to close the circuit for the coil 23 and the circuit-controller then operated to open the circuit of the exciting-coil; The opening of the circuit of the excitingcoil will cause a decrease in the magnetic flux, and this decrease I will induce a current in the coil 23, which tends to build up the decreasing magnetic flux' and to retard the movement of the part 21 out of the exciting-coil, thereby obtaining a slow and gradual application of the brake. In this form of the invention the circuit-controller 60 may be first operated to close the circuit of the coil 23 before the circuit-controller 70 is operated.'and then the brake will be withdrawn slowly, because of the choking effect of the coil 23. If it is desired to -be either interrupted or short-circ directions- It will be understood that I do not limit myself to the precise arrangement of circuits shown in Fig. 1 nor to the precise arrangement and form of the circuit-controllers, a all of the circuit-controllers may be comprised in a single device which may be so arranged that upon its operation the current will first be supplied to the exciting-coil .to withdraw the brake, and after the withdrawal of the brake the resistance will bebrought into the circuit, and finally when the applied the circuit, of the exciting-coil may the exciting-coil closed upon itself. In .Fig. 2- the two circuit-controllers may also\be included in a single device and operated successively to accomplish the results hereinbefore stated.- l 4 It will be seen, therefore, that my invention consists of electromagnetic means for operating a brake,

rent is generated when the exciting current for the electromagnetic means is supplied or cut off from it, which induced current tends brake ,is to be itedand .85 I

v which electromagnetic means v COIIIPIISESHdGVICGS by which an induced curto choke or build up the increasing or decreasing. magnetic flux of themeans and permit of a slow eration of the brake.

What I claim as my invention is v 1. An electromagnetic brake havingmeans operated by the magnetic flux for effecting a slow action of;tl1e brake.

electromagnetic 4 and gradual op- 2. In an electromagnetic brake, an excitingcoil for moving the brake in one direction and electromagnetic means which upon the deanergizing of the coil permits of a gradual action of the brake in an opposite direction,

8. "In an electromagnetic brake, an x iting coil for releasing the brake, and electromagnetic means which upon the deencrgizing of Said coil permits of a 'gradual. application of the brake.

4. In an electromagnetic brakethe combi nation of an exciting-coil and-a magnetic circuit comprising a movable part which is con nected with a brake,.a source of current-sup ply for said exciting-coil which coil, when-ex cited, produces magnetic influx in said mag nctic circuit to opgrate said movable part, and means which, upon the deenergizing of said exciting-coil, tendto build up the decreasing magnetic flux produced by deenergizing said exciting-coil, whereby a gradual action of said part is obtained.

nation of a coil .for operating the brake, and another coil for etfectingsia slow action of the brake. N

6. In an electromagnetic brake, the combi- 5. In an electromagnetic brake, the combi- ISO excites a current inone of the eoiis upon a cessation of current 1n another.

nation of a coil for operating the brake, and another coil for ,cfiecting the slow action of the brake in citherdirection.

7. The combination in an electromagnetic brake 'of an electromagnet for operating the brake, said electromagnet con prising excitingcoils and a magnetic circuit which latter '8. The combination n an electromagnetic brake, of an electromlgnet for operating.the brake, said electromagnt oomprisingexciting-coils and a magnetiddrcilitf which includes a movable part-and which eitcites a current m one of the coils upon a cessationof current in another.

9. The combination an electromagnetic brake, of an electromagnet for operatingtbe brake, said elect rornagnet comprising exciting-coils and a. magnetic-circuit which latter excites a current inone'of thezeoils upon a cessation of cnrrentin another,'and .means'for controlling the circhitbfZ-said exciting-coils, 10. The combination in an electromagnetic brake, of an electromagnetcomprising excit';

ing-coilS, and a movable part which is con nected with the brake, said exciting-coils being adapted, one to withdraw the brake and another to retard the application of the brake.

11. The combination'in an electromagnetic brake, of an electromagnet comprising exciting coils, and a 'movable' part which is connected with the brake, said exciting-coils being adapted, one to Withdraw the brake and another to retard the application of the brake, and means for controlling the circuits of said exciting-coils.

' 12. The combination in an electromagnetic brake, of means for moving the brake to apply it, and an electromagnet' for moving the brake to withdraw it, said electromagnet comprising exciting-coils, which are adapted one to withdraw the brake and another to retard the application of the brake byvsaid applying- 

